Jonas posted an identical photo on his social media account. Several of Turner's "Game of Thrones" co-stars, including Maisie Williams and Lena Headley, congratulated the couple on their pending nuptials.

There might be something in the water on the "Thrones" set. Turner's announcement comes just weeks after co-star Kit Harington announced his engagement to former "Game of Thrones" co-star Rose Leslie.